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Light control film

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Light control film


Disclosed is a light control film comprising: two of transparent conductive resin substrates each having a transparent conductive layer and a transparent resin substrate; and a light control layer interposed between the two transparent conductive resin substrates to be in contact with the transparent conductive layer sides, the light control layer containing: a resin matrix; and a light control suspension dispersed in the resin matrix, wherein the transparent conductive layer contains: an organic binder resin; and a conductive polymer. The present invention can provide a light control film having satisfactory adhesiveness between the light control layer and the transparent conductive layer and having excellent radio wave transparency.
Related Terms: Light Control Film

Inventors: Satoyuki Nomura, Yoshii Morishita, Tooru Tanaka
USPTO Applicaton #: #20120314276 - Class: 359296 (USPTO) - 12/13/12 - Class 359 


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The Patent Description & Claims data below is from USPTO Patent Application 20120314276, Light control film.

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TECHNICAL FIELD

The present invention relates to a light control film having a light control function.

BACKGROUND ART

A light control glass containing a light control suspension was first invented by Edwin Land, and the light control glass is in the form of a structure in which a liquid-state light control suspension is inserted between two of transparent conductive substrates having a narrow gap therebetween (see, for example, Patent Documents 1 and 2). According to the invention by Edwin land, the liquid-state light control suspension inserted between the two transparent conductive substrates is such that when an electric field is not applied, as a result of the Brownian motion of light control particles that are dispersed in the suspension, most of the incident light rays are reflected, scattered or absorbed by the light control particles, and only a very small portion is transmitted.

That is, the extent of transmission, reflection, scattering or absorption can be determined on the basis of the shape, nature and concentration of the light control particles dispersed in the light control suspension, and the amount of light energy irradiated. When an electric field is applied to a light control window which uses a light control glass having the above-described structure, an electric field is formed in the light control suspension through the transparent conductive substrates, and the light control particles that exhibit a light control function cause polarization and are arranged in parallel to the electric field. Then, light is transmitted between light control particles, and eventually, the light control glass becomes transparent. However, such an initial light control apparatus had problems in practical use, such as the aggregation of the light control particles inside the light control suspension, sedimentation due to their own weights, color phase change due to heat, changes in the optical density, deterioration caused by ultraviolet ray irradiation, difficulties in keeping up the gap between the substrates and in the injection of the light control suspension into the gap, and others. Accordingly, it was difficult to put the light control apparatus to practical use.

Robert L. Saxe, F. C. Lowell, and R. I. Thompson have respectively disclosed light control windows making use of light control glasses for which the initial problems of light control windows, namely, the aggregation and sedimentation of light control particles, changes in the optical density, and the like have been compensated (see, for example, Patent Documents 3 to 9). In these patented inventions, those initial problems are solved by using a liquid-state light control suspension, which includes needle-shaped light control crystal particles, a suspending agent for dispersing crystal particles, a dispersion control agent, a stabilizer and the like, and preventing the sedimentation of light control particles by matching the densities of the light control particles and the suspending agent to be almost equal, while preventing the aggregation of the light control particles by adding a dispersion control agent to increase the dispersibility of the light control particles.

However, since even these light control glasses also have a structure in which a liquid light control suspension is encapsulated in a gap between two transparent conductive substrates as in the case of conventional light control glasses, there is a problem that, in the case of the manufacture of large-sized products, uniform encapsulation of the suspension in the gap between the two transparent conductive substrates is difficult, and a swelling phenomenon in the lower part is likely to occur due to the difference in the hydraulic pressure between the upper part and the lower part of the product. Furthermore, when the gap between the substrates is changed due to the external environment, for example, the pressure of wind, the optical density is changed as a result, so that the color phase becomes inhomogeneous, Further, there is a problem that the sealing material in the peripheral area for holding a liquid between the transparent conductive substrates is destroyed, and the light control material leaks out. In addition, unevenness occurs in the response time as a result of deterioration by ultraviolet ray, and a decrease in the voltage between the peripheral areas and the center of the transparent conductive substrates.

As a method of improving this, there has been suggested a method of mixing a liquid light control suspension with a solution of a curable polymer resin, and producing a film by using a phase separation method based on polymerization, a phase separation method based on solvent volatilization, a phase separation method based on temperature, or the like (see, for example, Patent Document 10).

Furthermore, in a space surrounded by the light control glasses used heretofore, since the transparent conductive resin substrates used in the glasses have small surface resistivity and low radio wave transparency, there is a problem that television sets, mobile telephones, remote control devices utilizing radio waves, and the like may not function adequately.

CITATION LIST Patent Literatures

Patent Literature 1: U.S. Pat. No. 1,955,923 Patent Literature 2: U.S. Pat. No. 1,963,496 Patent Literature 3: U.S. Pat. No. 3,756,700 Patent Literature 4: U.S. Pat. No. 4,247,175 Patent Literature 5: U.S. Pat. No. 4,273,422 Patent Literature 6: U.S. Pat. No. 4,407,565 Patent Literature 7: U.S. Pat. No. 4,422,963 Patent Literature 8: U.S. Pat. No. 3,912,365 Patent Literature 9: U.S. Pat. No. 4,078,856 Patent Literature 10: Japanese Patent Application Laid-Open (JP-A) No. 2002-189123

SUMMARY

OF THE INVENTION Technical Problem

The present invention relates to a light control film used in the windowpanes or the like for use in vehicles such as automobiles, or in construction.

The transparent conductive layer of light control films used in the windowpanes for use in vehicles such as automobiles, trains and airplanes or use in construction, is a transparent conductive layer having low electrical resistance. Since low electrical resistance is simultaneously accompanied by high radio wave reflectivity, there is a problem that television sets, mobile telephones, remote control devices utilizing radio waves, and the like do not function adequately when these have been brought into a car or into a room.

Furthermore, there is also a problem with the adhesiveness between the transparent resin substrate and the transparent conductive layer of the transparent conductive resin substrate.

Solution to Problem

The inventors of the present invention conducted a thorough investigation, and as a result, they found that the problems described above could be solved by adopting a configuration in which a conductive polymer is incorporated in an organic binder, for the transparent conductive layer of the transparent conductive resin substrate.

Specifically, the present invention provides the following.

(1) A light control film comprising: two of transparent conductive resin substrates each having a transparent conductive layer and a transparent resin substrate; and a light control layer interposed between the two transparent conductive resin substrates to be in contact with the transparent conductive layer sides, the light control layer containing: a resin matrix; and alight control suspension dispersed in the resin matrix,

wherein the transparent conductive layer contains: an organic binder resin; and a conductive polymer.

(2) The light control film as described in the above item (1), wherein the conductive polymer is at least one selected from the group consisting of a polythiophene derivative, a polyaniline derivative, and a polypyrrole derivative.

(3) The light control film as described in the above item (1) or (2), wherein the conductive polymer is a resin obtainable by curing a polymerizable monomer or a polymerizable oligomer with heat or light.

(4) The light control film as described in any one of the above items (1) to (3), wherein the entirety or a portion of the organic binder resin is composed of (meth)acrylate containing a hydroxyl group.

(5) The light control film as described in any one of the above items (1) to (4), wherein the entirety or a portion of the organic binder resin is composed of urethane acrylate containing a pentaerythritol skeleton.

(6) The light control film as described in any one of the above items (1) to (5), wherein the transparent conductive layer has a surface resistivity value of 1000Ω/□ or greater.

(7) The light control film as described in any one of the above items (1) to (6), wherein the radio wave shielding property in the frequency region of 500 MHz or higher is 5 dB or less.

Advantageous Effects of Invention

The light control film of the present invention has excellent radio wave transparency, so that even inside a space surrounded by the light control film, television sets, mobile telephones, remote control devices utilizing radio waves, and the like can be made to function adequately. Furthermore, when a particular organic binder resin is used, the adhesiveness between the transparent resin substrate and the transparent conductive layer of the transparent conductive resin substrate can be made satisfactory.

The disclosure of the present application relates to the subject matters described Japanese Patent Application No. 2010-14191 filed on Jan. 26, 2010, the disclosure of which is incorporated herein by reference.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic view of the cross-sectional structure of an embodiment of the light control film of the present invention.

FIG. 2 are each a schematic view for explaining the operation in the case when an electric field is not applied to the light control film in FIG. 1.

FIG. 3 are each a schematic view for explaining the operation in the case when an electric field is applied to the light control film in FIG. 1.

FIG. 4 is a schematic view for explaining the state of an edge of the light control film. Illustration of light control particles 10 in liquid droplets 3 is omitted.

FIG. 5 is a diagram showing the results for the measurement of the radio wave shielding effect in the frequency region of 1 kHz to 1 GHz (Examples 1 to 3 and Comparative Examples 1 and 2).

FIG. 6 is a diagram showing the results for the measurement of the radio wave shielding effect in the frequency region of 1 GHz to 18 GHz (Examples 1 to 3 and Comparative Example 1).

BEST MODES FOR CARRYING OUT THE INVENTION

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stats Patent Info
Application #
US 20120314276 A1
Publish Date
12/13/2012
Document #
13575108
File Date
01/26/2011
USPTO Class
359296
Other USPTO Classes
International Class
02F1/167
Drawings
4


Light Control Film


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